class BootStrapForm(object):
    """
    bootstrap美化init方法
    """
    bootstrap_class_exclude = []

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        for name, field in self.fields.items():
            if name in self.bootstrap_class_exclude:
                continue

            old_class = field.widget.attrs.get('class', "")
            field.widget.attrs['placeholder'] = '请输入%s' % (field.label,)
            field.widget.attrs['class'] = 'form-control {}'.format(old_class)

